Pressure Mounts on Ukraine Leader

Antigovernment Protesters Reject President's Offers

By

James Marson

Updated Jan. 26, 2014 7:38 p.m. ET

KIEV, Ukraine—Antigovernment protests intensified on Sunday, posing the most serious threat to President Viktor Yanukovych's rule since demonstrations began here more than two months ago and raising the stakes in a battle for influence between Russia and the West.

Tens of thousands of protesters across Ukraine besieged government facilities and dug in at local administrations buildings they are occupying in several regional...